Front-engine, front-wheel-drive layout
In automotive design, a front-engine, front-wheel-drive (FWD) layout, or FF layout, places both the internal combustion engine and driven roadwheels at the front of the vehicle.
A 1975 Alfa Romeo Alfasud Sprint Veloce using a Longitudinally mounted front-engine and front-wheel drive.
The bonnet on this original Mini is open, showing the transversely mounted engine that drives the front wheels.
Mid-engine, front-wheel drive (MF layout): Renault 4 mid-engine, front-wheel-drive layout allows greater distance between front doors and wheelwells, and short front overhang.
Longitudinally front-mounted engine, front-wheel drive (FF longitudinal layout): The Auto Union 1000, (today Audi) longitudinal layout superseded the DKW F89 front transverse engines in the 1950s.
Rear-engine, rear-wheel-drive layout
In automotive design, an RR, or rear-engine, rear-wheel-drive layout places both the engine and drive wheels at the rear of the vehicle. In contrast to the RMR layout, the center of mass of the engine is between the rear axle and the rear bumper. Although very common in transit buses and coaches due to the elimination of the drive shaft with low-floor buses, this layout has become increasingly rare in passenger cars.
Mercedes-Benz O500LE coach chassis showing the engine located far behind the rear axle
BMW i3, a rear wheel drive, rear motor electric vehicle
Tatra 77, one of the first streamlined cars with RR platform
Volkswagen Bug/Beetle (VW Type 1)